Altera SDI II MegaCore Manual de usuario descargar pdf (Pagina 62)

Table 4-3: Sampling Process

The submodule executes the sampling process in the following manner.

Step Process Description

1 Detect transitions in the incoming

data.

The first part of the code detects the transitions in the

incoming data. This detection is done by comparing

adjacent bits in the incoming data word. This process

generates a word that indicates the position of the

transitions in the data

Example:

Data in = 1100000111

Transition = 0100001000

2 Generate a sample_now data by using

the transition data.

The submodule generates a sample_now bus from the

transition bus and the sample_mask. Since the data is not

sampled at the transition point, the submodule applies an

offset to which bit it selects using the sample mask. The

sample mask gives the position of the desired sample

relative to the transition point.

Example:

Data in = 1100000111

Transition = 0100001000

Sample now = 0000100001

3 Select and place the data bits in the

shift register.

If a bit in the sample_now bus is set, the corresponding bit

in the data input word is selected and placed into a shift

submodule places the value of din[4] into the shift register.

Example:

Data in = 1100000111

Transition = 0100001000

Sample now = 0000100001

Data to shift reg = xxxx0xxxx1

4 Remove the data bits from the shift

word.

The submodule removes samples from the shift register one

at a time and places them into consecutive bits in the output

word.

5 Assert dout_valid bit. The submodule asserts this bit to indicate that the word is

complete and ready for the downstream system to process.

4-20

RX Sample

UG-01125

2015.05.04

Altera Corporation

SDI II IP Core Functional Description

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Altera SDI II MegaCore Manual de usuario Pagina 62

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